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  <title>获取字符串的长度</title>
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    <li><a href="ref.mbstring.html">多字节字符串 函数</a></li>
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  <div id="layout-content"><div id="function.mb-strlen" class="refentry">
 <div class="refnamediv">
  <h1 class="refname">mb_strlen</h1>
  <p class="verinfo">(PHP 4 &gt;= 4.0.6, PHP 5, PHP 7, PHP 8)</p><p class="refpurpose"><span class="refname">mb_strlen</span> &mdash; <span class="dc-title">获取字符串的长度</span></p>

 </div>
   
 <div class="refsect1 description" id="refsect1-function.mb-strlen-description">
  <h3 class="title">说明</h3>
  <div class="methodsynopsis dc-description">
   <span class="methodname"><strong>mb_strlen</strong></span>(<span class="methodparam"><span class="type">string</span> <code class="parameter">$str</code></span>, <span class="methodparam"><span class="type">string</span> <code class="parameter">$encoding</code><span class="initializer"> = mb_internal_encoding()</span></span>): <span class="type"><a href="language.types.declarations.html#language.types.declarations.mixed" class="type mixed">mixed</a></span></div>

  <p class="para rdfs-comment">
   获取一个 <span class="type">string</span> 的长度。
  </p>
 </div>


 <div class="refsect1 parameters" id="refsect1-function.mb-strlen-parameters">
  <h3 class="title">参数</h3>
  <p class="para">
   <dl>
    
     <dt>
<code class="parameter">str</code></dt>

     <dd>

      <p class="para">
       要检查长度的<span class="type"><span class="type 字符串">字符串</span></span>。
      </p>
     </dd>

    
    
     <dt>
<code class="parameter">encoding</code></dt>

     <dd>

      <p class="para"><code class="parameter">encoding</code>
参数为字符编码。如果省略或是 <strong><code>null</code></strong>，则使用内部字符编码。</p>
     </dd>

    
   </dl>

  </p>
 </div>


 <div class="refsect1 returnvalues" id="refsect1-function.mb-strlen-returnvalues">
  <h3 class="title">返回值</h3>
  <p class="para">
   返回具有 <code class="parameter">encoding</code> 编码的<span class="type"><span class="type 字符串">字符串</span></span> <code class="parameter">str</code> 包含的字符数。
   多字节的字符被计为 1。
  </p>
  <p class="para">
   如果给定的 <code class="parameter">encoding</code> 无效则返回 <strong><code>false</code></strong>。
  </p>
 </div>


 <div class="refsect1 seealso" id="refsect1-function.mb-strlen-seealso">
  <h3 class="title">参见</h3>
  <p class="para">
   <ul class="simplelist">
    <li class="member"><span class="function"><a href="function.mb-internal-encoding.html" class="function" rel="rdfs-seeAlso">mb_internal_encoding()</a> - 设置/获取内部字符编码</span></li>
    <li class="member"><span class="function"><a href="function.grapheme-strlen.html" class="function" rel="rdfs-seeAlso">grapheme_strlen()</a> - Get string length in grapheme units</span></li>
    <li class="member"><span class="function"><a href="function.iconv-strlen.html" class="function" rel="rdfs-seeAlso">iconv_strlen()</a> - 返回字符串的字符数统计</span></li>
    <li class="member"><span class="function"><a href="function.strlen.html" class="function" rel="rdfs-seeAlso">strlen()</a> - 获取字符串长度</span></li>
   </ul>
  </p>
 </div>


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